OpenBSD Errata: January 27th, 2019 (unveil)

Errata patches for the kernel have been released for OpenBSD 6.4.
The unveil() system call can leak memory.
Binary updates for the amd64, i386, and arm64 platforms are available
via the syspatch utility. Source code patches can be found on the
errata page:
https://www.openbsd.org/errata64.html
As these affect the kernel, a reboot will be needed after patching.